Cutting the cord seems to be the way of the future. As new Li-ion batteries come into play, it makes sense to drop the extension cord for many reasons. The enforcement from General Contractors, OSHA and the building department pushing down on nicked extension cords is what lead us to look into other options. At first we reduced the size of the tales that came out of the tools, assuming this would reduce cords getting nicked and it did. Since we are in a world of light weight batteries with a larger power supply we see the advantages to dropping the cord completely.
Li-on Battery technology has advanced immensely and today we see battery powered jack hammers and chainsaws. The worry of a battery powered skill saw not cutting a few sheets of plywood is now over. We have always seen the typical 12V & less units, today you can get heavy duty 14V to 36V and since we now have this power you will use the tool with greater frequency.
Li-on batteries are what we choose to use because of weight, they are constructed of lightweight lithium. The issue of a heavy cordless tool are now a worry of the past. Also there are fewer safety risks when operating in wet conditions or elevated conditions. The mobility when you are on a ladder, lift or scaffolds is endless.
These batteries are said to make a tool 2 LBS lighter than the cordless equivalent, and also enabling contractors to get two times the capacity over NiCad batteries.
Li-on batteries are built with an onboard computer that manage the batteries power supply. This is said to help the life expectancy of 18 months of a NiCad battery to 3 years with the Li-on.
Initially you would think that the corded unit seems cheaper, but once you do the analysis you will see that fueling a generator, replacing cords and the time finding power will exceed the cost of the tool purchase. Li-on Batteries cost approximately 30 to 50% more than the old NiCad but the advantages are the life expectancy, weight and more power.